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LT1253/LT1254 Low Cost Dual and Quad Video Amplifiers
FEATURES
s s s s s s s s
DESCRIPTIO
Low Cost Current Feedback Amplifiers Differential Gain: 0.03%, RL = 150, VS = 5V Differential Phase: 0.28, RL = 150, VS = 5V Flat to 30MHz, 0.1dB 90MHz Bandwidth on 5V Wide Supply Range: 2V(4V) to 14V(28V) Low Power: 60mW per Amplifier at 5V
The LT1253 is a low cost dual current feedback amplifier for video applications. The LT1254 is a quad version of the LT1253. The amplifiers are completely isolated except for the power supply pins and therefore have excellent isolation, over 94dB at 5MHz. Dual and quad amplifiers significantly reduce costs compared with singles; the number of insertions is reduced and fewer supply bypass capacitors are required. In addition, these duals and quads cost less per amplifier than single video amplifiers. The LT1253/LT1254 amplifiers are ideal for driving low impedance loads such as cables and filters. The wide bandwidth and high slew rate of these amplifiers make driving RGB signals between PCs and workstations easy. The excellent linearity of these amplifiers makes them ideal for composite video. The LT1253 is available in 8-pin DIPs and the S8 surface mount package. The LT1254 is available in 14-pin DIPs and the S14 surface mount package. Both parts have the industry standard dual and quad op amp pin out. For higher performance, see the LT1229/LT1230.
APPLICATI
s s s
S
RGB Cable Drivers Composite Video Cable Drivers Gain Blocks in IF Stages
TYPICAL APPLICATI
5V VIN +
Transient Response
75 1/2 LT1253 - -5V RF 620 VOUT RG 620 75 75 CABLE
AV = 1 +
RF BW = 90MHz RG AT AMPLIFIER OUTPUT. 6dB LESS AT VOUT.
LT1253/54 * TA01
VS = 5V AV = 2 RL = 150 VO = 1V
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LT1253/54 * TA02
UO
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1
LT1253/LT1254 ABSOLUTE AXI U RATI GS
Storage Temperature Range ................ - 65C to 150C Junction Temperature (Note 2) ............................ 150C Lead Temperature (Soldering, 10 sec)................. 300C Total Supply Voltage (V + to V -) ............................. 28V Input Current ..................................................... 15mA Output Short-Circuit Duration (Note 1) ........ Continuous Operating Temperature Range LT1253C, LT1254C................................. 0C to 70C
PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT A -IN A +IN A V- 1 2 A 3 4 B 6 5 -IN B +IN B 8 7 V+ OUT B
ORDER PART NUMBER LT1253CN8 LT1253CS8 S8 PART MARKING 1253
N8 PACKAGE 8-LEAD PLASTIC DIP
S8 PACKAGE 8-LEAD PLASTIC SOIC
TJMAX = 150C, JA = 100C/ W (N) TJMAX = 150C, JA = 150C/ W (S)
ELECTRICAL CHARACTERISTICS
Symbol VOS +IB - IB AVOL PSRR CMRR VOUT IOUT IS RIN CIN Parameter Input Offset Voltage Noninverting Bias Current Inverting Bias Current Large-Signal Voltage Gain Power Supply Rejection Ratio Common-Mode Rejection Ratio Maximum Output Voltage Swing Maximum Output Current Supply Current Input Resistance Input Capacitance Power Supply Range Channel Separation SR Input Slew Rate Output Slew Rate Dual Single
0C TA 70C, VS = 5V to 12V, unless otherwise noted.
MIN TYP 5 1 20 MAX 15 15 100 UNITS mV A A V/V dB dB V V mA 11 mA M pF 12 24 88 125 250 V V dB V/s V/s
CONDITIONS
VS = 5V, VO = 2V, RL = 150 VS = 3V to 12V VS = 5V, VCM = 2V VS = 12V, RL = 500 VS = 5V, RL = 150 Per Amplifier
f = 10MHz AV = 1 AV = 2
2
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TOP VIEW
OUT A
1 2 3 4 5 6 7 B C A D
14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C 9 8
-IN C
OUT C
ORDER PART NUMBER LT1254CN LT1254CS
-IN A +IN A V+ +IN B -IN B
OUT B
N PACKAGE 14-LEAD PLASTIC DIP
S PACKAGE 14-LEAD PLASTIC SOIC
TJMAX = 150C, JA = 70C/ W (N) TJMAX = 150C, JA = 100C/ W (S)
560 60 55 7.0 2.5 30 1 2 4
1500 70 65 10.5 3.7 55 6 10 3
LT1253/LT1254
ELECTRICAL CHARACTERISTICS
Symbol tr tp Parameter Small-Signal Rise Time Rise and Fall Time Propagation Delay
0C TA 70C, VS = 5V to 12V, unless otherwise noted.
MIN TYP 3.5 5.8 3.5 MAX UNITS ns ns ns
CONDITIONS VS = 12V, AV = 2 VS = 5V, AV = 2, VOUT = 1VP-P VS = 5V, AV = 2
Note 1: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas:
LT1253CN8: TJ = TA + (PD x 100C/W) LT1253CS8: TJ = TA + (PD x 150C/W) LT1254CN: TJ = TA + (PD x 70C/W) LT1254CS: TJ = TA + (PD x 100C/W)
TYPICAL AC PERFOR A CE
BANDWIDTH
VS 12 12 12 12 12 12 12 12 12 12 5 5 5 5 5 5 5 5 5 5 AV 1 1 -1 -1 2 2 5 5 10 10 1 1 -1 -1 2 2 5 5 10 10 RL 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 1000 150 RF 1100 1000 750 768 715 715 680 680 620 620 787 787 715 715 620 620 620 620 562 562 RG None None 150 768 715 715 180 180 68.1 68.1 None None 715 715 620 620 150 150 61.9 61.9 Small Signal - 3dB BW (MHz) 270 204 110 89 179 117 106 90 89 80 218 158 76 70 117 92 82 72 70 65 Small Signal - 0.1dB BW (MHz) 51 48 59 50 76 62 42 47 49 46 53 91 28 30 58 52 36 34 35 28 Small Signal Peaking (dB) 3.4 1.3 0.1 0.1 0.3 0 0 0 0.1 0.1 1.5 0.1 0.1 0.1 0.1 0.1 0 0 0 0
NTSC VIDEO (Note 1)
VS 12 12 5 5 AV 2 2 2 2 RL 1000 150 1000 150 RF 750 750 750 750 RG 750 750 750 750 DIFFERENTIAL GAIN 0.01% 0.01% 0.03% 0.03% DIFFERENTIAL PHASE 0.03 0.12 0.18 0.28
Note 1: Differential Gain and Phase are measured using a Tektronix TSG 120 YC/NTSC signal generator and a Tektronix 1780R Video Measurement Set. The resolution of this equipment is 0.1% and 0.1. Ten identical
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amplifier stages were cascaded giving an effective resolution of 0.01% and 0.01.
3
LT1253/LT1254
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
10
OUTPUT SATURATION VOLTAGE (V)
V+ -0.5
9 8
SUPPLY CURRENT (mA)
-55C 25C 125C
COMMON-MODE RANGE (V)
7 6 5 4 3 2 1 0 0 2 4 8 10 12 14 6 SUPPLY VOLTAGE (V) 16 18 175C
LT1253/54 * TPC01
Settling Time to 10mV vs Output Step
10 8 6
DISTORTION (dBc)
NONINVERTING
INVERTING
-30
POWER SUPPLY REJECTION (dB)
OUTPUT STEP (V)
4 2 0 -2 -4 -6 -8 -10 0 20 40 60 SETTLING TIME (ns) 80 100 NONINVERTING INVERTING VS = 12V RF = RG = 1k
LT1253/54 * TPC04
Spot Noise Voltage and Current vs Frequency
100
OUTPUT IMPEDANCE ()
-in
10
OUTPUT SHORT-CIRCUIT CURRENT (mA)
SPOT NOISE (nV/Hz OR pA/Hz)
10
en +in 1 10
100
1k 10k FREQUENCY (Hz)
4
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LT1253/54 * TPC07
Output Saturation Voltage vs Temperature
V+ - 0.5 -1.0 -1.5 -2.0
Input Common-Mode Limit vs Temperature
-1.0 RL = 2V VS 12V
V + = 2V TO 12V
2.0 1.5 1.0 0.5 V- - 50 -25 V - = -2V TO -12V
1.0 0.5 V- -50 -25
50 0 25 75 TEMPERATURE (C)
100
125
0 25 50 75 TEMPERATURE (C)
100
125
LT1253/54 * TPC02
LT1253/54 * TPC03
2nd and 3rd Harmonic Distortion vs Frequency
-20 VS = 12V VO = 2VP-P RL = 100 RF = 750 AV = 10dB
Power Supply Rejection vs Frequency
80 VS = 12V RL = 100 RF = RG = 750 POSITIVE 40
60
2ND
-40 3RD -50
NEGATIVE 20
-60
-70 1 10 FREQUENCY (MHz) 100
LT1253/54 * TPC05
0 10k
100k
1M 10M FREQUENCY (Hz)
100M
LT1253/54 * TPC06
Output Impedance vs Frequency
100 VS = 12V
70
Output Short-Circuit Current vs Temperature
60
1.0 RF = RG = 2k 0.1 RF = RG = 750
50
0.01
40
100k
0.001 10k
100k
1M 10M FREQUENCY (Hz)
100M
30 -50 -25
0
25 50 75 100 125 150 175 TEMPERATURE (C)
LT1253/54 * TPC09
LT1253/54 * TPC08
LT1253/LT1254
TYPICAL PERFOR A CE CHARACTERISTICS
12V Frequency Response
5 4 3 2 PHASE 0 -20 -40 -60
GAIN (dB)
0 -1 -2 -3 -4 -5 1M VS = 12V AV = 1 RL = 150 RF = 1k 10M 100M FREQUENCY (Hz)
GAIN
GAIN (dB)
1
12V Frequency Response
12 11 10 9 PHASE 0 -20 -40 -60
GAIN (dB)
GAIN (dB)
8 7 6 5 4 3 2 1M VS = 12V AV = 2 RL = 150 RF = 715 RG = 715 GAIN
10M 100M FREQUENCY (Hz)
12V Frequency Response
26 25 24 23
GAIN (dB)
21 20 19 18 17 16 1M VS = 12V AV = 10 RL = 150 RF = 620 RG = 68.1 GAIN
GAIN (dB)
22
10M 100M FREQUENCY (Hz)
UW
5V Frequency Response
5 4 3 2
PHASE (DEG)
0 -20 -40 PHASE -60
PHASE (DEG)
-80 -100 -120 -140 -160 -180 -200 1G
LT1253/54 * TPC10
1 0 -1 -2 -3 -4 -5 1M VS = 5V AV = 1 RL = 150 RF = 787 10M 100M FREQUENCY (Hz) 1G
LT1253/54 * TPC11
-80 -100 GAIN -120 -140 -160 -180 -200
5V Frequency Response
12 11 10 9 PHASE 0 -20 -40 -60
PHASE (DEG)
PHASE (DEG)
-80 -100 -120 -140 -160 -180 -200 1G
LT1253/54 * TPC12
8 7 6 5 4 3 2 1M VS = 5V AV = 2 RL = 150 RF = 620 RG = 620 GAIN
-80 -100 -120 -140 -160 -180 -200 10M 100M FREQUENCY (Hz) 1G
LT1253/54 * TPC13
5V Frequency Response
0 -20 -40 26 25 24 23
PHASE (DEG)
0 -20 -40 PHASE -60
PHASE
-60 -80 -100 -120 -140 -160 -180 -200 1G
LT1253/54 * TPC14
PHASE (DEG)
22 21 20 19 18 17 16 1M VS = 5V AV = 10 RL = 150 RF = 562 RG = 61.9 GAIN
-80 -100 -120 -140 -160 -180 -200 1G
LT1253/54 * TPC15
10M 100M FREQUENCY (Hz)
5
LT1253/LT1254
TYPICAL PERFOR A CE CHARACTERISTICS
Transient Response Transient Response
VS = 5V AV = 1 RL = 150
RF = 787 VO = 1V
APPLICATIO S I FOR ATIO
Power Dissipation
The LT1253/LT1254 amplifiers combine high speed and large output current drive into very small packages. Because these amplifiers work over a very wide supply range, it is possible to exceed the maximum junction temperature under certain conditions. To insure that the LT1253/ LT1254 are used properly, we must calculate the worst case power dissipation, define the maximum ambient temperature, select the appropriate package and then calculate the maximum junction temperature. The worst case amplifier power dissipation is the total of the quiescent current times the total power supply voltage plus the power in the IC due to the load. The quiescent supply current of the LT1253/LT1254 has a strong negative temperature coefficient. The supply current of each amplifier at 150C is less than 7mA and typically is only 4.5mA. The power in the IC due to the load is a function of the output voltage, the supply voltage and load resistance. The worst case occurs when the output voltage is at half supply, if it can go that far, or its maximum value if it cannot reach half supply. For example, let's calculate the worst case power dissipation in a video cable driver operating on a 12V supply that delivers a maximum of 2V into 150.
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LT1253/54 * TPC16
RF = 562 RG = 61.9 VO = 1.5V
VS = 5V AV = 10 RL = 150
LT1253/54 * TPC17
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PDMAX = 2 x VS x ISMAX + (VS - VOMAX) x VOMAX/RL PDMAX = 2 x 12V x 7mA + (12V - 2V) x 2V/150 = 0.168 + 0.133 = 0.301 Watt per Amp Now if that is the dual LT1253, the total power in the package is twice that, or 0.602W. We now must calculate how much the die temperature will rise above the ambient. The total power dissipation times the thermal resistance of the package gives the amount of temperature rise. For the above example, if we use the S8 surface mount package, the thermal resistance is 150C/W junction to ambient in still air. Temperature Rise = PDMAX x RJA = 0.602W x 150C/W = 90.3C The maximum junction temperature allowed in the plastic package is 150C. Therefore the maximum ambient allowed is the maximum junction temperature less the temperature rise. Maximum Ambient = 150C - 90.3C = 59.7C Note that this is less than the maximum of 70C that is specified in the absolute maximum data listing. In order to use this package at the maximum ambient we must lower the supply voltage or reduce the output swing.
LT1253/LT1254
APPLICATIO S I FOR ATIO
As a guideline to help in the selection of the LT1253/ LT1254, the following table describes the maximum supply voltage that can be used with each part based on the following assumptions: 1. The maximum ambient is 70C. 2. The load is a double-terminated video cable, 150. 3. The maximum output voltage is 2V (peak or DC).
SI PLIFIED SCHE ATIC
One Amplifier
V+
+IN
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
0.300 - 0.320 (7.620 - 8.128)
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.020 (0.508) MIN
(
+0.025 0.325 -0.015 +0.635 8.255 -0.381
)
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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MAX POWER at MAX TA LT1253CN8 LT1253CS8 LT1254CN LT1254CS VS < 14 (Abs Max) VS < 10.6 VS < 11.4 VS < 7.6 0.800W 0.533W 1.143W 0.727W
-IN VOUT V-
LT1253/54 * SS
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N8 Package 8-Lead Plastic DIP
0.400 (10.160) MAX 8 7 6 5
0.130 0.005 (3.302 0.127)
0.250 0.010 (6.350 0.254)
1
2
3
4
0.018 0.003 (0.457 0.076)
N8 0392
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LT1253/LT1254
PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted. N Package 14-Lead Plastic DIP
0.065 (1.651) TYP 14 13 12 0.770 (19.558) MAX 11 10 9 8
0.300 - 0.325 (7.620 - 8.255)
0.015 (0.380) MIN 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 -0.015 +0.635 8.255 -0.381
0.260 0.010 (6.604 0.254)
(
)
0.075 0.015 (1.905 0.381)
0.018 0.003 (0.457 0.076) 0.100 0.010 (2.540 0.254)
1 0.125 (3.175) MIN
2
3
4
5
6
7
N14 0392
S8 Package 8-Lead SOIC
0.189 - 0.197 (4.801 - 5.004) 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0.016 - 0.050 0.406 - 1.270 0.053 - 0.069 (1.346 - 1.752) 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157 (3.810 - 3.988) 8 7 6 5
0- 8 TYP
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
1
2
3
4
SO8 0392
S Package 14-Lead SOIC
0.337 - 0.344 (8.560 - 8.738) 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0.053 - 0.069 (1.346 - 1.752) 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157 (3.810 - 3.988) 14 13 12 11 10 9 8
0 - 8 TYP
0.016 - 0.050 0.406 - 1.270
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
1
2
3
4
5
6
7
SO14 0392
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
LT/GP 0193 10K REV 0
(c) LINEAR TECHNOLOGY CORPORATION 1993

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